Question
A series is given with one term missing. Choose the
correct alternatives from the given ones that will complete the series. 325, 350, 399, 520, 689, ____.Solution
The given series is addition of square of consecutive prime numbers starting from 5. 325 + 5Β² = 325 + 25 = 350 350 + 7Β² = 350 + 49 = 399 399 + 11Β² = 399 + 121= 520 520 + 13Β² = 520 + 169 = 689 689 + 17Β² = 689 + 289 = 978
Solve the equation: sin x = 1/2, 0 β€ x β€ 2Ο
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